<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator="/">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>參數列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 頭部警告區域 -->
      <el-alert title="注意: 只允許為第三級分類設置相關參數" type="warning" :closable="false" show-icon></el-alert>
      <!-- 選擇商品分類区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
            v-model="selectedCateKeys"
            :options="catelist"
            :props="{ 
                expandTrigger: 'hover',
                value: 'cat_id',
                label: 'cat_name',
                children: 'children'
             }"
            @change="handleChange"
          ></el-cascader>
        </el-col>
        <!-- tab页签区域 -->
        <el-col :span="24">
          <el-tabs v-model="activeName" @tab-click="handleTabClick">
            <!-- 添加动态参数的面板 -->
            <el-tab-pane label="动态参数" name="many">
              <el-button
                type="primary"
                size="mini"
                :disabled="isBtnDisabled"
                @click="addDialogVisible = true"
              >添加参数</el-button>
              <el-table :data="manyTableData" border stripe>
                <!-- 展开行 -->
                <el-table-column type="expand">
                  <template slot-scope="scope">
                    <!-- 循环渲染tag标签 -->
                    <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="hanleClose(i, scope.row)">{{item}}</el-tag>
                    <!-- 输入文本框 -->
                    <el-input
                      class="input-new-tag"
                      v-if="scope.row.inputVisible"
                      v-model="scope.row.inputValue"
                      ref="saveTagInput"
                      size="small"
                      @keyup.enter.native="handleInputConfirm(scope.row)"
                      @blur="handleInputConfirm(scope.row)"
                    ></el-input>
                    <!-- 添加按钮 -->
                    <el-button
                      v-else
                      class="button-new-tag"
                      size="small"
                      @click="showInput(scope.row)"
                    >+ New Tag</el-button>
                  </template>
                </el-table-column>
                <!-- 索引列 -->
                <el-table-column type="index"></el-table-column>
                <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                <el-table-column label="操作">
                  <template slot-scope="scope">
                    <el-button
                      size="mini"
                      type="primary"
                      icon="el-icon-edit"
                      @click="showEditDialog(scope.row.attr_id)"
                    >编辑</el-button>
                    <el-button
                      size="mini"
                      type="danger"
                      icon="el-icon-delete"
                      @click="removeParams(scope.row.attr_id)"
                    >删除</el-button>
                  </template>
                </el-table-column>
              </el-table>
            </el-tab-pane>
            <!-- 添加静态属性的面板 -->
            <el-tab-pane label="静态属性" name="only">
              <el-button
                type="primary"
                size="mini"
                :disabled="isBtnDisabled"
                @click="addDialogVisible = true"
              >添加属性</el-button>
              <el-table :data="onlyTableData" border stripe>
                <!-- 展开行 -->
                <el-table-column type="expand">
                  <template slot-scope="scope">
                    <!-- 循环渲染tag标签 -->
                    <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="hanleClose(i, scope.row)">{{item}}</el-tag>
                    <!-- 输入文本框 -->
                    <el-input
                      class="input-new-tag"
                      v-if="scope.row.inputVisible"
                      v-model="scope.row.inputValue"
                      ref="saveTagInput"
                      size="small"
                      @keyup.enter.native="handleInputConfirm(scope.row)"
                      @blur="handleInputConfirm(scope.row)"
                    ></el-input>
                    <!-- 添加按钮 -->
                    <el-button
                      v-else
                      class="button-new-tag"
                      size="small"
                      @click="showInput(scope.row)"
                    >+ New Tag</el-button>
                  </template>
                </el-table-column>
                <!-- 索引列 -->
                <el-table-column type="index"></el-table-column>
                <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                <el-table-column label="操作">
                  <template slot-scope="scope">
                    <el-button
                      size="mini"
                      type="primary"
                      icon="el-icon-edit"
                      @click="showEditDialog(scope.row.attr_id)"
                    >编辑</el-button>
                    <el-button
                      size="mini"
                      type="danger"
                      icon="el-icon-delete"
                      @click="removeParams(scope.row.attr_id)"
                    >删除</el-button>
                  </template>
                </el-table-column>
              </el-table>
            </el-tab-pane>
          </el-tabs>
        </el-col>
      </el-row>
    </el-card>

    <!-- 添加参数对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClose"
    >
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 修改参数对话框 -->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClose"
    >
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>
<script>
export default {
  data() {
    return {
      catelist: [],
      selectedCateKeys: [],
      //   被激活的页签的名称
      activeName: 'many',
      manyTableData: [],
      onlyTableData: [],
      addDialogVisible: false,
      addForm: {
        attr_name: ''
      },
      addFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      },
      editDialogVisible: false,
      editForm: {},
      editFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      },
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败')
      }
      this.catelist = res.data
      //   console.log(this.catelist)
    },
    async handleChange() {
      this.getParamsData()
    },
    // tab 页签点击事件的处理函数
    handleTabClick() {
      // console.log(this.activeName)
      this.getParamsData()
    },
    // 获取参数列表数据
    async getParamsData() {
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      // 证明选中的是三级分类
      // console.log(this.selectedCateKeys)
      // 根据所选分类的id，和当前所处的面板，获取对应的参数
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes`,
        {
          params: { sel: this.activeName }
        }
      )

      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败！')
      }
      
      res.data.forEach(item => {
        // item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // item.inputVisible = false
        item.inputVisible = false
        item.inputValue = ''
      })

      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
      // console.log(res.data)
    },
    addDialogClose() {
      this.$refs.addFormRef.resetFields()
    },
    // 点击按钮添加参数
    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post(
          `categories/${this.cateId}/attributes`,
          {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName
          }
        )
        if (res.meta.status !== 201) {
          return this.$message.error('添加参数失败')
        }
        this.$message.success('添加参数成功')
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    async showEditDialog(attr_id) {
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes/${attr_id}`,
        {
          params: { attr_sel: this.activeName }
        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数失败')
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },
    editDialogClose() {
      this.$refs.editFormRef.resetFields()
    },
    editParams() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put(
          `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          {
            attr_name: this.editForm.attr_name,
            attr_sel: this.activeName
          }
        )
        if (res.meta.status !== 200) {
          return this.$message.error('修改失败')
        }
        this.$message.success('修改成功')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    async removeParams(attr_id) {
      const confirmResult = await this.$confirm(
        '此操作将永久删除该参数, 是否继续?',
        '提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }
      ).catch(err => err)
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除')
      }
      // 删除的业务逻辑
      const { data: res } = await this.$http.delete(
        `categories/${this.cateId}/attributes/${attr_id}`
      )
      if (res.meta.status !== 200) {
        return this.$message.error('删除参数失败')
      }
      this.$message.success('删除参数成功')
      this.getParamsData()
    },
    async handleInputConfirm (row) {
      if(row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      this.saveAttrVals(row)
    },
    async saveAttrVals (row) {
       // 需要发起请求，保存这次数据
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join('')
      })
      if(res.meta.status !== 200) {
        return this.$message.error('修改参数失败')
      }
      this.$message.success('修改参数成功')
    },
    showInput (row) {
      row.inputVisible = true
       this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus();
        });
    },
    hanleClose (i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
    }
  },
  computed: {
    // 如果按钮需要被禁用，则返回true。否则返回false
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    // 动态计算标题文本
    titleText() {
      if (this.activeName === 'many') {
        return '动态参数'
      } else {
        return '静态属性'
      }
    }
  }
}
</script>
<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}
.el-tag {
  margin: 10px;
}
.input-new-tag {
  width: 120px;
}
</style>